Supplemental Oil & Natural Gas Data (Unaudited) Change in Standardized Measure of Discounted Net Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 16, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2014
Predecessor
Change in Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves
Standardized measure—beginning of year	$ 3,833,415	$ 4,035,279
Sales and transfers of oil, natural gas and NGL produced during the period	(703,597)	(625,707)
Changes in estimated future development costs	20,932	(331,498)
Net change in sales and transfer prices and production costs related to future production	(214,489)	(786,022)
Extensions, discoveries and improved recovery	189,625	124,466
Purchases of minerals in place		114,094
Sales of minerals in place	13,279	15,283
Previously estimated development costs incurred during the period	(401,791)	(497,036)
Net change due to revisions in quantity estimates	(856,118)	743
Accretion of discount	496,718	570,505
Income taxes	237,117	323,128
Changes in production rates and other	166,480	(73,326)
Net increase (decrease)	(274,820)	(201,864)
Standardized measure—end of year	3,558,595	3,833,415
Successor
Change in Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves
Standardized measure—beginning of year			3,558,595	4,635,332
Sales and transfers of oil, natural gas and NGL produced during the period			(30,208)	(794,337)
Changes in estimated future development costs			0	68,290
Net change in sales and transfer prices and production costs related to future production			(1,272)	(1,020,605)
Extensions, discoveries and improved recovery			0	674,392
Purchases of minerals in place				548,256
Sales of minerals in place			0	486,903
Previously estimated development costs incurred during the period			0	(269,473)
Net change due to revisions in quantity estimates			0	(66,696)
Accretion of discount			19,184	463,533
Income taxes			1,109,522
Changes in production rates and other			(20,489)	39,642
Net increase (decrease)			1,076,737	(304,955)
Standardized measure—end of year			$ 4,635,332	$ 4,330,377